Surfacing and polishing machine.



No. 817,013. PATENTED APR. 8, 1906. A T. SPENGE, J. H. PRUGH & S. B. ZIMMER.

SUBFAGING AND POLISHING MACHINE.

APPLIOATION FILED AUG. 12.1905.

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AARQN T. SPENCE, JOHN H. PRUGH, AND SAMUEL B. ZIMMER,

FRANCISCO, CALIFORNIA.

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OF SAN SUPFAGlNG AND POLISHING MACHINE.

Specification of Letters Patent.

Patented. April 3, 1906.

Application filed August 12, 1905. Serial No. 273,942.

To all whom it may concern:

Be itknown that we, AARON T. SPENCE, JOHN H. PRUGH, and SAMUEL 'B. ZIMMER, citi- Zens of the United States, residing in the city and county of San Francisco and State of California, have invented new and useful I1nprovements in Surfacing and Polishing Machines, of which the following is a specification.

()ur invention relatesto an apparatus especially designed for smoothing mosaic and other oors or surfaces.

It consists in the combination of mechanism whereby a smoothing or polishing surface is reeiprocated over the surface to be acted upon, means for moving the polisher with relation to the surface, and in details of construction, which will be more fully explained by reference to the accompanying drawings, in which- Figure 1 is a bottom view of our apparatus. Fig. 2 is a side elevation. longitudinal section.

Our apparatus consists of a suitable frame or carriage A, having bearing-wheels 2, steering-wheels 3, with a suitable motor 4, from which power is derived to move the carriage and to actuate the polishing devices. The steering may be effected by means of a wormgear shaft 5 and handwheel, through which motion may be transmitted to turn the steer ing-wheels to right or left by suitable connections such as are common to motor-propelled vehicles.

6 is a crank-shaft journaled across the frame or carriage and will be driven by means of a sprocket 7, fixed upon the shaft, a chain 8 passing around this sprocket and around a sprocket 9 upon a driving-shaft, to which shaft power may be transmitted from the motor, as at 4, by chain or other equivalent driving mechanism.

11 represents metal or other equivalent frames or boxes open at top and bottom and adapted to receive blocks of stone, as at 12. These blocks are locked in the frames by Wedges, clamps, or other locking devices, so that they may at any time be removed and replaced by others when Worn. The lower surfaces of these stones provide the polishingsurface. They are moved over the surfaces tobe polished by means of connecting-rods 13, extending from the cranks 14 of the crank- Fig. 8 is a central.

in pairs and closely together, and the connectin *rods 13 are so offset from each other that tie extension from these connectingrods to the boxes 11 stand substantially m line with the intermediate arm 14 of the two contiguous cranks. These cranks project in opposite direction from the crank-shaft, and.

it will thus be seen that as they are revolved the boxes 11 are alternately drawn toward each other and forced outwardly, sliding over the surface to be polished and having motion equal to the throw of the cranks. By this construction the movement of the polishers is opposed in such a manner as to be perfectly balanced, the thrust and pull being in line with the center arm of each two contiguous cranks, and as the cranks are moved in opposite direction the o posed movement of the polishers will be be anced. The weight being approximately the same, all strain u on the journal-boxes of. the cr'ank-shaft-wil be avoided.

Above the line of travel of the polishers and supported by the carria e are watertanks, as at 5, and. these tan is have dripcocks, as at 6, by which a supply of water may be )rovided to assist in the polishing.

In order to insure. the movement of the polishing-frames in proper alinement, guides 17 are fixed to the carriage-frame. and project upon each side of the line of travel of the frames 11 thus insurin their movin in a desired direction and without undue si e move ment.

shaft and revolves them in opposite directions.

By means of any suitable clutch, as 20, travehng upon a feather on the shaft, either of the ears may be engaged with and revolved by t e pinion, the engaged one acting to revolve the bearing-wheels 2 and move the car in one direction, while the other ears turn idly upon the shaft. To reverse t e motion of the carriage, the clutch is disenga ed from one gearavheeland is engaged with t 1e other, so that the continued motion of the pinion in one direction will reverse the movement of shaft 6. These cranks are here shown placed i the wheel-shaft. in this manner and by aid ICC of the steering -gear the machine may be moved to any part of the surface to be. actedv on and may be caused to travel slowly over the surface during the polishing operation.

Having thus described our invention, what we claim, and desire to secure by'Letters Pat ent, is

'1. In a surfacing and olishing machine, a frame supported with re ation to the surface to be acted upon, .a crank-shaft journaled transversely across said frame having contiguous cranks with opposite throw, a motor and connections by which the shaft is re- 'volved, abrading-surfaces and containers therefor located at opposite ends of the frame or carriage, connectin -rods' between said containers and the cran s, bearing-wheelsfor said frame, and driving connections between the motor and said wheels whereby the frame is advanced in either direction by the motor.

'2. In a surfacing and olishing machine, a frame sup orted with re ation to the surface to be acte on, wheels u on which the frame is supported, reciprocatm'g polishers located at opposite ends of the frame, means for guiding t e polishers, a shaft having contiguous cranks of opposite throw, connections between said cranks and the polishers whereby the reciprocating movements of the polishers are balanced, a motor and connections for driving the shaft, and connections between the motor and the wheels whereby the frame is advanced in either direction by the motor.

3. In a portable surfacing and olishing machine, a wheeled frame supported with re lation to the surface to be acted upon, guided slidable polishers carried at opposite ends of the frame, a' transverselyjournaled shaft upon the frame having contiguous cranks of opposite throw, and'the intermediate arm of said cranks common to both, connecting-rods extending from the cranks and communicating motion to the polishers, said connections being offset so that the portions connecting with the polishers are substantially in line with the central arm of the cranks.

4. In a portable surfacing and olishing' machine, a wheeled frame supporte with relation to the surface to be acted on, a motordriven shaft journaled upon the frame having contiguous cranks with o osite throw, and the intermediate arm of sea cranks common to both, guidedslidable polishers located upon opposite sides of the crank-shaft, arms fixed centrally to'said polishers extending in line with the central arm of the cranks from opposite sides, and connecting-rods from the the motor, slidable polishers upon op osite sides of the crank-shaft, one connecte with each of the cranks, said connections having an offset by which the opposite lines thrust and pull are substantially in line with the intermediate'arm of the crank-shaft, and guides fixed upon the frame between which the ends of the polishers are movable.

6. In a portable surfacing and (polishing machine, a wheeled frame supporte with relation to the surface to be acted on, a motor and means whereby the frame is advanced in either direction thereby, polishers comprisin open containing-frames having stones locke therein with their lower surfaces projecting to contact with the surface to be polished and extending transversely of the carria e, a shaft having cranks of opposite throw, an offset rods'connecting said cranks with the center of inertia of the polishers, and guides between which the polishers are reciprocated.

7. In a portable surfacing and polishing machine, 1a wheeled frame supported with relation to the surface to be acted on, a motor and means whereby the frame is advanced in either direction thereby, guided polishers carried by the frame and means by which an oposed and balanced reciprocation of said pollshers is effected.

8. In a portable surfacing and polishing machine, a wheeled frame having a'doublc opposed crank-shaft journaled thereon, slida e polishers connected with the cranks of said shaft, bearing and steering wheels upon which the frame is mounted, a motor and 9. In a surfacing and polishing machine,

guided slidable olishers resting upon the surface, a Wheele frame carrying ajournaled shaft with double op osed cranks, connections between the pohshers and the cranks, mechanism including a motor and connections therefrom by which the driving-wheels of the car are pro elled in either direction, and a steering mec ianism whereby the direction of the car and the travel of the polishers may be changed.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

AARON T. SPENCE. JOHN H. PRUGH. SAMUEL B. ZIMMER.

Witnesses for A. T. Spence:

L. S. SJoBERe,

W. FREAR. 

